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United States Patent |
5,197,043
|
Strader
|
March 23, 1993
|
Night and day earth clock calendar
Abstract
A clock, a calendar, and a two dimensional model of the earth viewed
looking at the polar axis as the earth is rotated during a twenty-four
hour period thus showing day and night, dawn and dusk. The shadow cast on
the earth by the absence of the sun's rays are also shown. The changing of
said shadow to show the seasons of the year is also shown as the shadow is
rotated once every 365 days. The disc containing the rotating shadow has a
pointer that tells the observer the month of the year and the day of the
month along with the sign of the zodiac. The rotating earth map has
symbols to represent the major cities of the earth and a symbol to
represent the pole.
Inventors:
|
Strader; Verne A. (3307 92nd Ave. Ct., E, Puyallup, WA 98371)
|
Appl. No.:
|
677497 |
Filed:
|
March 29, 1991 |
Current U.S. Class: |
368/27; 368/23; 368/28 |
Intern'l Class: |
G04B 019/22 |
Field of Search: |
368/21-27,15-18
|
References Cited
U.S. Patent Documents
197246 | Nov., 1877 | Cates | 368/27.
|
557173 | Mar., 1896 | Thompson | 368/27.
|
641540 | Jan., 1900 | Pheils | 368/27.
|
1344913 | Jun., 1920 | Long | 368/27.
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1990012 | Feb., 1935 | Woodruff | 368/27.
|
2245842 | Jun., 1941 | Werner | 368/27.
|
2657525 | Nov., 1953 | Allen | 368/27.
|
4579468 | Apr., 1986 | Shannon | 368/27.
|
Primary Examiner: Roskoski; Bernard
Claims
I claim:
1. A world clock comprising:
a clock frame having a center;
a single rotating map disc being a dimensionally accurate polar projection
of the earth's continents, including twenty-four symbolic lines radiating
from the earth's pole and said lines representing the earth's twenty four
meridians, said map having a diameter representing the equator;
a stationary time scale disc surrounding said rotating map, said time scale
containing discrete units representing hours of the day, the months of the
year and the signs of the zodiac, whereas these discrete symbols allow the
user to readily tell the time of day, the day of the year, the month of
the year and the sign of the zodiac;
a stationary apertured disc having an aperture with the same diameter as
the equator, said stationary apertured disc being mounted above the map
disc;
a rotating transparent disc mounted above the stationary apertured disc and
above the rotating map disc, said transparent disc having light and dark
semicircles printed thereon, said semicircles representing daylight and
nightfall, said transparent disc further having a marker on its surface
that points to the day of the month of the year along with the sign of the
zodiac;
a set of symbols representing the locations of the major cities of the
world and the earth's poles are printed on the rotating map disc;
a drive mechanism rotating said map disc at least once every twenty four
hours; and wherein the center of the clock frame and the center of the
time disc and the center of the transparent disc are coaxial and aligned;
and wherein the map disc has the earth's pole at its center, said pole
being offset from and not coincident with the aligned and coaxial centers.
2. A world clock as recited in claim 1 whereby said transparent disc
rotates 1/365 revolutions per a 24 hour day in a counter clockwise
direction for a disc for the northern hemisphere and a clockwise direction
for the southern hemisphere, said transparent disc is mutually exclusive
of the earth disc and said transparent disc has a marker printed on its
surface that points to the day and month of the year along with the
astrological sign of the zodiac.
3. A standard 12 hour clock as recited in claim 1 whereby 3 pointer
rotating hands are mounted under said rotating world map, said hands or
coincident with the stationary time scale, the short hand makes 2
revolutions per earth day, the medium length hand makes 24 revolutions per
earth day and the longest hand makes 1,440 revolutions per earth day.
4. A world clock as recited in claim 1 or 2 said drive mechanism rotates
said map 366/365 revolutions per 24 hours synchronized to the earth's
rotation relative to the sun.
5. A world clock as recited in claims 1 and 2 wherein said discrete symbols
are a plurality of numerals.
6. A device as recited in claim 1 wherein the world map has discrete
symbols printed on said surface, each symbol represents the major cities
of the northern (or southern) hemisphere, said rotating world map has a
discrete symbol also placed at the location of the north (or south) pole,
said world map has 24 symbolic meridian lines radiating from the polar
axis.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates in general to clocks and in particular to a calendar
clock which shows the rotation of the earth through night and day; it
shows the earth in shadow as half of the earth turns away from the sun's
rays; it shows the month and day of the year and it shows the position of
certain major cities as each city revolves through night and day. It also
shows the position of the north pole, and it shows parts of the earth that
lay between the equator and the Tropic of Capricorn. It also shows the 24
time zones that make up the earth's meridians.
2. Prior Art
It is well known that there are many devices for showing the earth's
relationship to the sun and also to the time of day. Some of these are
earth globes which are usually shown set at a 231/2.degree. tilt from the
vertical. By shining a light on the globe's surface and rotating said
globe, one can obtain a good idea of the earth's relationship to the sun
and subsequently the time of day for specific places on the earth's
surface. Unfortunately, it is rather difficult to carry a globe with you
when you are traveling or carrying out business. Therefore it is my idea
to combine a clock and a globe in a convenient package such as a wrist
watch. This said watch will do all these functions above mentioned and
more. My clock or watch is not limited however to just a wrist watch. It
may be a wall mount, desk top or any other size watch or clock. My
invention is a two dimensional solution to this problem. Students of
astronomy, international businessmen, military personnel, travelers,
pilots, and people in general would be interested in this clock or watch.
Other two dimensional "earth clocks" are listed below.
The D. W. Thompson "Geographical Clock Dial" U.S. Pat. No. 557,173, Mar.
31, 1896. This device uses a movable screen to show the earth's shadow and
must be adjusted from time to time. The north pole (or south pole) is not
adjusted for the earth's tilting axis. The clock is a twenty-four hour
clock and runs in a counter clockwise direction making this device hard to
read. There is no system for the days or months of the year.
The S. W. Boggs "Horological Instrument and Related Devices" U.S. Pat. No.
2,056,089, Sep. 29, 1936. This device uses a stationery earth disc instead
of a rotating disc which makes it difficult to read. This device also uses
a twenty-four hour clock in place of the more standard twelve hour clock.
The north pole is not offset to make up for the tilt of the earth. There
is no system to determine the months or seasons or the day of the year.
SUMMARY OF THE INVENTION
My patent is a clock and calendar that transforms the three dimensional
view of the earth into a practical two dimensional representation. The
clock part of this invention is a standard twelve hour time keeping system
with a second, minute and hour hand.
The earth is viewed as it rotates on its polar axis. This particular view
is of the northern hemisphere, however, this clock could be built to show
the southern hemisphere as well. The view looking down at the northern
hemisphere includes the Tropic of Capricorn just as you would see in a
three dimensional view.
The disc representing the earth is offset from the center of the clock and
rotates counter clockwise 366/365 revolutions per day. Covering this earth
disc is a fixed aperture. This aperture causes the earth disc to be
re-centered thus giving a more accurate view of the earth's spin by
compensating for the earth's tilt.
Covering this earth disc and the aperture is a transparent disc that has a
shaded semi-circle superimposed on its face. Said semi-circle it lined up
to cast a shadow over one half of the earth. This transparent disc rotates
once every 365 days in a counter clockwise direction. The purpose of this
shaded area is to show the shadow caused by the absence of the sun's rays,
thus creating night and day, also dawn and dusk. It also shows the various
seasons, that is, summer, fall, winter, and spring. This disc also has a
pointer located close to the outside edge which points to the month and
day of the year.
Major cities of the northern hemisphere such as New York, London, Tokyo,
Rome, etc. may be highlighted with colored dots to highlight their
relative positions thereby giving the time of day for each city so marked.
The north pole is marked with a star or some other device to show its
location. The 24 time zone meridians are also shown radiating outward from
the north pole.
This clock, calendar and earth model is encased in a rigid frame such as
metal or plastic and the face is covered by a clear transparent material.
BRIEF DESCRIPTIONS OF THE DRAWINGS
FIG. 1 is a plan view of the earth clock and calendar device.
FIG. 2 is an enlarged sectional elevation view of the earth clock and
calendar device.
FIG. 3 is an exploded view of the earth clock and calendar device.
DETAILED DESCRIPTION
As shown in the drawings, the earth clock and calendar device is shown as a
wrist watch. It is not necessarily limited to a wrist watch but could be
any size watch or clock. I have chosen the wrist watch format for
explanation purposes and to show it can be built on a small scale.
DESCRIPTION OF THE PREFERRED CONFIGURATION
While this invention can be built in many different configurations, there
are shown in these drawings certain arrangement of parts with the
understanding that the present disclosure is to be considered as an
example of the principles of the invention and not intended to limit said
invention to the configurations illustrated. The scope of the invention
will be pointed out in the section labeled claims.
Referring to FIGS. 1, 2, and 3 the device is composed of a transparent
material such as plastic or glass 1 that is set in a rigid frame such as
plastic or metal 2 these above devices hold and protect the moving parts,
and become part of the outside shell.
Underneath the protective transparent cover is another transparent disc 3,
this disc is also a gear and has a shaded semi-circle superimposed on the
face of said transparent disc. This disc rotates one revolution each 365
days and its axis is coincident with the axis of the clock frame.
Underneath the moving transparent disc is an aperture device 4 this is a
opaque rigid material and is supported by braces that radiate from the
center of the device 6. The braces 6 are attached to a hollow shaft 7
which is attached to the rigid clock frame. The axis of said shaft is
coincident with the frame of the clock 2. The aperture has a diameter that
is equal to the diameter of the semi-circle on the movable transparent
disc. The aperture is fixed and its axis is coincident with the axis of
the clock frame and the movable transparent disc.
Underneath said aperture is the earth disc 5 this is a disc made of rigid
material and graphically represents the earth as it rotates around its
polar axis. This earth disc rotates 366/365 revolutions per day. The earth
disc's axis is not coincident with the axis of the aperture but is offset
to show the tilt of the earth. The amount of the offset is equal, but not
limited to one fourth of the aperture's radius.
Underneath said earth disc are two gears of equal size 8. These gears drive
the earth disc 366/365 revolutions per day in a counter clockwise
direction. The shaft 10 drives said gears and is hooked directly to the
motor.
Underneath said earth disc is a clock dial 9 that represents the twelve
positions of a standard twelve hour two revolutions per day clock system.
This dial does not move and its axis is coincident with the frame of the
clock.
Located under the earth disc and shaped in a way to come under the earth
disc but over the clock dial are the hands of the clock; the second hand
11, the minute hand 12, and the hour hand 13. These said pointer hands are
the standard type hands normally seen in a clock movement.
Coincident with the axis of the clock frame and mounted over the rigid
hollow shaft 7 are the gears for the standard twelve hour clock system.
The hour hand gears 14, the minute hand gears 15, the second hand gears
16.
The drive motor for the standard twelve hour clock system described above
is 17, this is a quartz system that activates the gear system 16 driving
the set of second hand gears. This is one of two quartz motors used in
this device.
The second quartz motor shown 24 is attached to the large gear 18. This
said motor drives the earth disc and also drives the system of gears 19,
20, 21, 22, and the two equal gears both shown as 23. Both large gears 3,
and 18 have the same diameter and the same number of teeth, both said
gears turn in unison and both make one revolution every 365 days. During
leap year the clock will have to be readjusted.
The battery 25 activates both motors 17 and 24. Motor 24 axis is coincident
with the axis of the clock's frame and said motor rotates one revolution
per 365 days. This said motor uses a brush system to receive electric
current because it revolves.
There are three stations to set the time and the position of the earth and
the earth's shadow. The time set 26 sets the location of the earth's
shadow. The time set 27 sets the location of the earth. The time set 28
sets the time of day for the standard twelve hour clock system.
The lower part of the rigid clock frame 29 locks together with the upper
part 2 to complete the protective shell. The clock frame has the signs of
the zodiac graphically displayed on the outside shoulder 30 and has the
months and days of each month on the inside shoulder underneath the
protective transparent covering 31.
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